A woman appears to have accidentally fatally shot herself in the head with a gun bought to prepare for possible Ferguson-related unrest, according to sources briefed on the police investigation.

The shooting occurred Friday night in downtown St. Louis, the city’s Metropolitan Police Department said, in an area dominated by vacant lots beside a football stadium.

The female victim, identified in a police report as Becca Campbell, 26, was a passenger in a car involved in an auto accident. Her 33-year-old boyfriend was driving, the sources told CNN.

The boyfriend, who wasn’t identified, told police that the couple had bought a gun because of fears of unrest related to the pending grand jury decision on the shooting of Michael Brown, the sources said.